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Income Taxes - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($)
Income Taxes [Line Items] |
Net deferred tax asset | $ 0
Federal [Member] |
Income Taxes [Line Items] |
Net operating loss carryforwards | $ 161,506,084
Net operating loss carryforwards expiration year | 2025
Net operating loss carryforwards expiration year | 2037
Foreign [Member] |
Income Taxes [Line Items] |
Net operating loss carryforwards | $ 31,766,091
2025 Through 2027 [Member] |
Income Taxes [Line Items] |
Net operating loss carryforwards subject to expiration | 43,000,000
2028 Through 2036 [Member] |
Income Taxes [Line Items] |
Net operating loss carryforwards subject to expiration | $ 119,000,000

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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